A construction method for erecting large-span curved beams and inclined arches across busy waterways using a few supports

Abstract

The present application discloses a method for erecting a large-span curved beam and inclined arch across a busy waterway with a few supports, which relates to the field of construction of a connecting truss connection system, and includes the following steps: S1, erecting a hoisting system on the top of two adjacent ground-type steel pipe supports, and placing the connecting truss on a barge according to the installation posture; S2, hoisting the connecting truss to the installation height of the connecting truss through two hoisting systems, and fixing the connecting truss to the ground-type steel pipe support; S3, installing the arch rib; S4, after the arch rib is installed, remove the connection between the connecting truss and the ground-type steel pipe and lower the connecting truss to the barge through two hoisting systems. The present application has the advantages of not needing to erect a steel platform on the water, replacing the floating hoisting method, effectively reducing the impact on the navigation of the busy waterway, so that when the arch rib erection support is constructed, the normal navigation of the busy waterway is ensured.

Description

Technical Field

[0001] The invention relates to the field of construction of a connecting truss connection system, and in particular to a construction method for erecting a large-span curved beam and inclined arch across a busy waterway using a few supports. Background Art

[0002] During the construction of an arch-beam combined bridge, it is necessary to provide an erection foundation for the arch ribs through an arch rib erection bracket, and the arch rib erection bracket is erected in the form of a ground-mounted steel pipe bracket combined with a connecting truss.

[0003] The existing construction process is: the connecting truss is hoisted by the four-point hoisting method of a 600t floating crane, and a water steel platform is set up as the connecting truss hoisting construction platform. The truss connection system is lifted when the wind and waves are small, the barge withdraws from the station, and the floating crane slowly approaches the installation position by turning the anchor, and slowly lifts the connecting truss to the position just above the connecting seat plate, and adjusts the posture of the connecting truss. After the alignment and installation, the floating crane releases the hook, and the floating crane and 10t fall chain are used to install the connecting truss oblique leg support, and the connecting truss upper walkway is installed.

[0004] However, during the construction process, the steel platform was set up as a construction platform and lifted by a floating crane, which had a significant impact on the normal navigation of the busy waterway, and there is room for improvement. Summary of the invention

[0005] In order to ensure the normal navigation of busy waterways, the present application provides a construction method for erecting a large-span curved beam and inclined arch across a busy waterway using a few supports.

[0006] The present application provides a method for erecting a large-span curved beam and inclined arch across a busy waterway using a few supports, which adopts the following technical solutions:

[0007] A method for erecting a large-span curved beam and inclined arch across a busy waterway using a few supports method comprises the following steps:

[0008] S1. Set up a hoisting system on the top of two adjacent floor-standing steel pipe supports and place the connecting truss on the barge according to the installation posture;

[0009] S2. Lift the connecting truss to the installation height of the connecting truss through two lifting systems, and fix the connecting truss to the floor-standing steel pipe bracket;

[0010] S3. Install arch ribs;

[0011] S4. After the arch ribs are installed, the connection between the connecting truss and the floor-standing steel pipe is removed and the connecting truss is lowered to the barge through two lifting systems.

[0012] By adopting the above technical solution, by arranging the lifting system on the top of the ground-type steel pipe support, and transporting the connecting truss to the lifting position in an installation posture, the lifting is carried out by the lifting system, and there is no need to erect a steel platform on the water. The floating lifting method is replaced, which effectively reduces the impact on the navigation of busy waterways and ensures the normal navigation of busy waterways during the construction of the arch rib erection support.

[0013] Preferably, in step S1, the hoisting system includes two sets of hoisting mechanisms respectively located on both sides of the ground-mounted steel pipe support, and the layout direction of the two sets of hoisting mechanisms is perpendicular to the extension direction of the connecting truss.

[0014] By adopting the above technical solution, by arranging two sets of lifting mechanisms on the front and rear sides of the ground-mounted steel pipe support, space is provided for the arch rib installation, thereby avoiding interference with the lifting mechanisms during the arch rib installation process.

[0015] Preferably, the hoisting mechanism in step S1 is set as a first hoist;

[0016] In step S2, when the connecting truss is hoisted, a guiding system is provided between the connecting truss and the ground-type steel pipe support.

[0017] By adopting the above technical solution, the guide system guides the hoisting of the connecting truss, reduces the shaking of the connecting truss during the hoisting process, and facilitates the positioning and installation of the connecting truss after it is hoisted to a specified height.

[0018] Preferably, the guide system in step S2 includes guide mechanisms located on both sides of the floor-standing steel pipe bracket. After the connecting truss is hoisted between the two floor-standing steel pipe brackets, the guide mechanism is driven by a power mechanism to move to contact the side of the floor-standing steel pipe bracket, so that a guide groove that cooperates with the floor-standing steel pipe bracket is formed between the two sets of guide mechanisms to hoist the connecting truss.

[0019] By adopting the above technical solution, the guidance of the connecting truss during the hoisting process is realized, and by setting a power mechanism, the connecting truss is first moved between two ground-mounted steel pipe supports, and then the guiding mechanism is pushed out. The construction steps are reasonable and the construction efficiency is high.

[0020] Preferably, an adjusting mechanism for adjusting the posture of the arch ribs is provided at the top of the floor-standing steel pipe support; and a pier is provided on the connecting truss, and an adjusting mechanism for adjusting the posture of the arch ribs is provided on the pier.

[0021] By adopting the above technical solution, in step S3, when installing the arch rib, the posture of the arch rib is adjusted by the adjustment mechanism.

[0022] Preferably, the connecting truss includes a main truss and diagonal bracing trusses arranged on both sides of the bottom end of the main truss, and the diagonal bracing trusses are used to be fixed to the floor-standing steel pipe bracket.

[0023] By adopting the above technical solution, after the main truss is installed in place, the diagonal bracing truss is connected to the ground-mounted steel pipe bracket to further support the main truss and increase the structural strength of the main truss.

[0024] Preferably, the diagonal bracing truss is arranged in a triangular shape, and one end of the diagonal bracing truss away from the floor-standing steel pipe bracket is hinged to the main truss;

[0025] In step S1, when the connecting truss is located on the barge, the chord of the diagonal bracing truss away from its hinged end is in a horizontal state and fixed on the barge;

[0026] In step S2, after the main truss and the floor-standing steel pipe bracket are installed, the diagonal bracing truss is driven to rotate until the chord away from its hinged end is in a vertical state, and the diagonal bracing truss is fixed to the floor-standing steel pipe.

[0027] By adopting the above technical scheme, the various functional conversions of the diagonal bracing trusses are realized by switching the states of the diagonal bracing trusses, which not only provides a supporting placement foundation for the main truss and places the main truss on the barge according to the installation posture, but also facilitates the adjustment of the position of the diagonal bracing truss and fixes it to the ground-type steel pipe bracket after the connecting truss is hoisted into place through cooperation with the traction mechanism, without the need to erect the diagonal bracing truss in the air, thereby reducing the difficulty of high-altitude operations.

[0028] Preferably, in step S2, the diagonal bracing truss is driven to rotate by a traction mechanism.

[0029] By adopting the above technical solution, the driving of the diagonal bracing truss is realized, and the switching of the diagonal bracing truss between different states is convenient.

[0030] Preferably, the traction mechanism includes a second winch arranged on a floor-standing steel pipe support.

[0031] By adopting the above technical solution, when the traction rope is retracted by the winch, the diagonal bracing truss is pulled to rotate toward the ground-type steel pipe support, thereby achieving traction of the diagonal bracing truss.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. By installing the hoisting system on the top of the floor-standing steel pipe support and transporting the connecting truss to the hoisting position in an installation posture, the hoisting system is used for hoisting, without the need to erect a steel platform on the water, replacing the floating hoisting method, effectively reducing the impact on the navigation of busy waterways, ensuring the normal navigation of busy waterways during the construction of the arch rib erection support;

[0034] 2. By switching the state of the diagonal bracing truss, the diagonal bracing truss can be converted into multiple functions. It not only provides a support and placement foundation for the main truss and places the main truss on the barge according to the installation posture, but also facilitates the adjustment of the position of the diagonal bracing truss and fixes it to the floor-standing steel pipe bracket after the connecting truss is hoisted in place through cooperation with the traction mechanism. There is no need to build the diagonal bracing truss in the air, which reduces the difficulty of high-altitude operations;

[0035] 3. During the erection process of the large-span curved beam and inclined arch with few supports disclosed in the present application, the connecting trusses and the arch ribs are hoisted in sections, thereby ensuring the normal navigation of the waterway and avoiding the risk of hoisting super-large arch rib segments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram showing the state of the connecting truss in the embodiment of the present application being hoisted into place.

[0037] Figure 2 It is a schematic diagram showing the state in which the connecting truss in the embodiment of the present application is placed on a barge.

[0038] Figure 3 It is a schematic diagram showing the structure of the arch rib and the adjustment hydraulic lever in the embodiment of the present application.

[0039] Description of reference numerals:

[0040] 1. Connecting truss; 11. Main truss; 12. Diagonal bracing truss; 13. Guide mechanism; 131. Guide frame; 132. Electric push rod; 2. Floor-standing steel pipe bracket; 3. Hoisting mechanism; 31. Temporary support; 311. Connecting beam; 32. First winch; 4. Second winch; 5. Arch rib; 6. Adjusting hydraulic cylinder. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-3 This application is described in further detail.

[0042] The present application discloses a method for erecting a large-span curved beam and inclined arch across a busy waterway using a few-support method, comprising the following steps:

[0043] S1. Construction preparation:

[0044] S11. Installation of hoisting system

[0045] A hoisting system is installed on the top of two adjacent floor-standing steel pipe supports 2.

[0046] The hoisting system includes two sets of hoisting mechanisms 3, which are respectively located at the front and rear sides of the floor-standing steel pipe support 2. The hoisting mechanism 3 includes a temporary support 31 provided on the floor-standing steel pipe support 2 and a first winch 32 fixed on the temporary support 31. A plurality of connecting beams 311 are provided between the two temporary supports 31, and the connecting beams 311 are welded and fixed to the floor-standing steel pipe support 2.

[0047] S12, Transportation of connecting truss 1

[0048] The connecting truss 1 is placed on the barge in an inclined manner according to the installation posture, so that the connecting truss 1 can be directly installed after being hoisted into place, and there is no need to adjust the inclination angle of the connecting truss 1.

[0049] The connecting truss 1 comprises a main truss 11 and diagonal bracing trusses 12 arranged at both sides of the bottom end of the main truss 11. Both ends of the main truss 11 are respectively provided with a guiding system, which is used to guide the connecting truss 1 when the connecting truss 1 is lifted.

[0050] The guide system includes a guide mechanism 13 located on the front and rear sides of the main truss 11. The guide mechanism 13 is a guide frame 131 that is slidably fitted on the main truss 11. The main truss 11 is provided with a power mechanism for driving the guide frame 131 to move in a direction parallel to the main truss 11. The power mechanism is set as an electric push rod 132.

[0051] The two diagonal bracing trusses 12 are arranged in a triangular shape with different side lengths and inner angles. The diagonal bracing trusses 12 are hinged to the main truss 11 at one end angle away from the ground-type steel pipe bracket 2. When the connecting truss 1 is placed on the barge, the diagonal bracing truss 12 is rotated until the chord away from its hinged end is in a horizontal state and is placed on the barge, and the diagonal bracing truss 12 is fixedly connected to the barge by anchor bolts. At this time, the chords of the two diagonal bracing trusses 12 away from the corresponding hinged ends are in the same horizontal plane; when the connecting truss 1 is hoisted to the installation position and the main truss 11 is installed, the diagonal bracing truss 12 is driven to rotate by the traction mechanism until the chord away from the hinged end of the diagonal bracing truss 12 is in a vertical state, and then the diagonal bracing truss 12 is welded to the ground-type steel pipe bracket 2 and the main truss 11 to achieve further support for the main truss 11.

[0052] The traction mechanism includes a second winch 4 arranged on the floor-standing steel pipe support 2 .

[0053] S2. Installation of connecting truss 1:

[0054] The barge loaded with the connecting truss 1 is moved into position, and the guide frame 131 is first driven by the electric push rod 132 to move to the side contact with the ground-type steel pipe support 2, so that a guide groove matching the ground-type steel pipe support 2 is formed between the two guide frames 131 to guide the rise of the connecting truss 1;

[0055] The connection between the diagonal bracing truss 12 and the barge is released, and the connecting truss 1 is lifted by the first winch 32. When the connecting truss 1 is lifted into place, the main truss 11 is first welded and fixed to the ground-type steel pipe support 2, and then the diagonal bracing truss 12 is pulled by the second winch 4 to rotate toward the ground-type steel pipe support 2. When the chord of the diagonal bracing truss 12 away from its hinged end is in a vertical state, the diagonal bracing truss 12 is welded to the ground-type steel pipe support 2 and the main truss 11 to complete the installation of the connecting truss 1.

[0056] S3, Arch Rib 5 Installation:

[0057] The floor-standing steel pipe support 2 and the connecting truss 1 are both provided with an adjustment mechanism for adjusting the installation posture of the arch rib 5. The adjustment mechanism includes a plurality of adjustment hydraulic cylinders 6 arranged circumferentially around the arch rib 5. The posture of the arch rib 5 is adjusted by adjusting the extension and retraction of the output end of the hydraulic cylinder 6.

[0058] The arch ribs 5 are hoisted and placed on the floor-standing steel pipe support 2 and the adjusting mechanism of the connecting truss 1 , and the installation posture of the arch ribs 5 is adjusted before the adjacent arch ribs 5 are joined.

[0059] S4, dismantling of connecting truss 1:

[0060] After the arch rib 5 is installed, the connecting truss 1 is dismantled, and then the connecting truss 1 is lowered onto the barge through the lifting system and transported to the designated location.

[0061] The present application discloses a method for erecting a large-span curved beam and inclined arch across a busy waterway with a few supports. The method comprises the following steps: placing a hoisting system on the top of a ground-mounted steel pipe support 2, transporting a connecting truss 1 to a hoisting position in an installed posture, and supporting a main truss 11 on a barge or when installed in place by switching the state of the diagonal bracing truss 12. The hoisting is performed by a hoisting system without the need to erect a steel platform on the water, thereby replacing the floating hoisting method. The method effectively reduces the impact on the navigation of the busy waterway, and ensures the normal navigation of the busy waterway when the support for the arch rib 5 is erected.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for erecting a large-span curved beam and inclined arch across a busy waterway using a few supports, characterized in that: The following steps are involved: S1. Setting up a hoisting system at the top of two adjacent floor-standing steel pipe supports (2), and placing the connecting truss (1) on the barge according to the installation posture; S2, lifting the connecting truss (1) to the installation height of the connecting truss (1) by two lifting systems, and fixing the connecting truss (1) to the floor-standing steel pipe support (2); S3, installing the arch rib (5); S4. After the arch rib (5) is installed, the connection between the connecting truss (1) and the floor-standing steel pipe is removed and the connecting truss (1) is lowered to the barge through two lifting systems.

2. The method for erecting a large-span curved beam and inclined arch across a busy waterway with few supports according to claim 1 is characterized in that: In step S1, the hoisting system includes two sets of hoisting mechanisms (3) respectively located on both sides of the floor-standing steel pipe support (2), and the layout direction of the two sets of hoisting mechanisms (3) is perpendicular to the extension direction of the connecting truss (1).

3. The method for erecting a large-span curved beam and inclined arch across a busy waterway with few supports according to claim 2 is characterized in that: The hoisting mechanism (3) in step S1 is set as a first hoist (32); In step S2, when the connecting truss (1) is hoisted, a guiding system is provided between the connecting truss (1) and the floor-standing steel pipe support (2).

4. The method for erecting a large-span curved beam and inclined arch across a busy waterway with few supports according to claim 3 is characterized by: The guide system in step S2 includes guide mechanisms (13) located on both sides of the floor-standing steel pipe bracket (2). After the connecting truss (1) is hoisted between the two floor-standing steel pipe brackets (2), the guide mechanism (13) is driven by a power mechanism to move to contact the side of the floor-standing steel pipe bracket (2), so that a guide groove that cooperates with the floor-standing steel pipe bracket (2) is formed between the two sets of guide mechanisms (13), and the connecting truss (1) is hoisted.

5. The method for erecting a large-span curved beam and inclined arch across a busy waterway using a few supports as described in claim 1 is characterized by: The top of the floor-standing steel pipe support (2) is provided with an adjustment mechanism for adjusting the posture of the arch rib (5); the connecting truss (1) is provided with a buttress, and the buttress is provided with an adjustment mechanism for adjusting the posture of the arch rib (5).

6. The method for erecting a large-span curved beam and inclined arch across a busy waterway using a few supports as described in claim 1 is characterized by: The connecting truss (1) comprises a main truss (11) and diagonal bracing trusses (12) arranged on both sides of the bottom end of the main truss (11), and the diagonal bracing trusses (12) are used to be fixed to the floor-standing steel pipe bracket (2).

7. The method for erecting a large-span curved beam and inclined arch across a busy waterway with few supports according to claim 6 is characterized by: The diagonal bracing truss (12) is arranged in a triangular shape, and one end of the diagonal bracing truss (12) away from the floor-standing steel pipe bracket (2) is hinged to the main truss (11); In step S1, when the connecting truss (1) is located on the barge, the chord of the diagonal bracing truss (12) away from its hinged end is in a horizontal state and fixed on the barge; In step S2, after the main truss (11) and the floor-standing steel pipe bracket (2) are installed, the diagonal bracing truss (12) is driven to rotate until the chord away from its hinged end is in a vertical state, and the diagonal bracing truss (12) is fixed to the floor-standing steel pipe.

8. The method for erecting a large-span curved beam and inclined arch across a busy waterway using a few supports as described in claim 7 is characterized by: In step S2, the diagonal bracing truss (12) is driven to rotate by the traction mechanism.

9. The method for erecting a large-span curved beam and inclined arch across a busy waterway with few supports according to claim 8, characterized in that: The traction mechanism comprises a second hoist (4) arranged on a floor-standing steel pipe support (2).

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